Carbon and Nitrogen content and cell biovolume of marine protist Rhizaria (Radiolaria and Phaeodaria)

Published: 01-04-2021| Version 1 | DOI: 10.17632/j9262jxgt8.1
Joost Mansour,
Natalia Llopis Monferrer,
Andreas Norlin,
Stéphane L’Helguen,
Fabrice Not


Full data table for Carbon content, Nitrogen content, and biovolume measurements of planktic Rhizaria. This data is associated with the publication: Mansour, J.S., Norlin, A., Llopis Monferrer, N., L'Helguen, S., and Not, F. (2020). Carbon and nitrogen content to biovolume relationships for marine protist of the Rhizaria lineage (Radiolaria and Phaeodaria). Limnol. Oceanogr. doi: 10.1002/lno.11714 Rhizaria are ubiquitous in oceanic waters. They have previously been underestimated due to their fragility, but recent (molecular) studies show that they are major components of the planktic community and contribute greatly to, among others, the carbon and silica flux. This study provides key data on the carbon and nitrogen content of Rhizaria and its relation to cell biovolume. Here presented are the raw data of measured (CN Elemental Analyzer) carbon and nitrogen content of Rhizaria (i.e. specifically Collodaria, Acantharia, Nassellaria, Spumellaria, Aulacantha, Protocystis, and Challengeria), as well as picture-based estimates of biovolume and derived characteristics. The biovolume to mass relationship for these protists has allowed the formulation of mass to volume equations and ratios that can be used to estimate mass from biovolume. Our data shows that global Rhizaria biomass might have in fact still been underestimated. This will be pivotal information for studies of ocean ecology and for modeling biomass fluxes, whether it is biogeographic or smaller-scale system dynamics.


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Elemental data was obtained by CN analysis and biovolume was measured from specimen photographs. Photographs are sorted in by species (Taxa) and Sample ID in separate folders. Collodaria are further sorted by Sampling date before Sample ID. Aulacantha and Challengeria are further sorted by Location/cruise before Sample ID. Photographs are either accompanied by an XML file in which the scale by pixel is indicated, if not the magnification is given in a text file or in the file name and needs to be correlated to the scalebar of the same magnification, as in the photos in the same folder group. Photographs of parts of large Collodaria colonies are stitched together to form an image of the full colony, the scale corresponds to that as given in the XML used for the stitched image. Further information and specifics on the data, the samples, and its collection can be found in the publication. doi: 10.1002/lno.11714